The mechanism underlying the magnitude-reverse phenomenon of the mean spanwise velocity with respect to an increasing rotation number in a streamwise-rotating channel flow is investigated through a budget balance analysis of Reynolds shear stress u2′u3′. It is found that u2′u3′»imposes a negative feedback to itself through the production term, which prevents its magnitude from increasing monotonically with an increasing rotation number. This behavior of u2′u3′»further leads to the magnitude reverse in the spanwise wall shear stress and mean spanwise velocity in the near-wall region.
Bibliographical noteFunding Information:
Z.Y. would like to thank the support of the NSFC Basic Science Center Program for “Multiscale Problems in Nonlinear Mechanics” (Grant No. 11988102) and the Lixing research funding of Institute of Mechanics, Chinese Academy of Sciences. The DNS database was established under the support of the Natural Sciences and Engineering Research Council (NSERC) of Canada to B.-C.W.